Method of forming expansion joints and castings.



O. F. CODA.

METHOD OF FORMING EXPANSION JOINTS AND GASTINGS.

APPLICATION FILED JAN. 2, 1912.

1,125,062, Patented Jan. 19, 1915.

2 SHEETS-SHEET 1.

llllllllllllllll THE NORRIS PETERS 50.. PHnlD-LITHQ. WASHINGTON, L;

0. F. CODA. METHOD OF FORMING EXPANSION JOINTS AND GASTINGS.

APPLIGATI-ON FILED JAN. 2, 1912.

Patented Jan. 19, 1915.

2 SHEETS-SHEET 2.

THE NORRIS PETERS co., PHOTO LITHQ. \VASHINGI'UN. D c.

CHRISTOPHER E. cone, or DETROIT, ruronreaiv, assisnon To THE ART sTovE COMPANY, OE DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

METHOD OF FORMING EXPANSION. JOINTS A1 lD CASTINGS.

Application filed January 2.

TO'aZZ whom it may concern Be it known that I, CHRISTOPHER F. CODA, a citizen of the United States of America, residingat Detroit, in the county of Wayne and State of Michigan. have invented certain new and useful Improvements in Methods of Forming Expansion Joints and Castings, of which the following is a specifi-' cation, reference. being had therein'to the accompanying drawings. v

The invention relates to cast metal structures in which there is a differential expansion and contraction caused by unequal heatmg. I

It is the object of the invention to maintain an integral construction and at the same time to provide for the independent contraction and expansion of portions thereof, and to this end the invention consists in the method of forming the structure as hereinafter set forth.

In the drawings,-Figure 1 is a plan view of a cast metal furnace ring constructed in accordance with my invention; Fig. 2 is a cross section on line 0am Fig. 1 illustrating the manner of forming the structure; Fig. 3 is a similar view showing the complete struc ture. Fig. 4: is a cross section through the mold showing the pattern in place; Fig. 5 is a cross-section through the mold showing the parts separated and the pattern with drawn from the sand. Fig. 6 is a crosssection through a portion of the mold showing the core member in position; Fig. 7 is a cross section through a portion of the mold taken at right angles to Fig. 6.

My invention is particularly applicable to stove and furnace constructions in which cast metal parts are employed and which are subjected to unequal heating efitects. Thus in furnace constructions it is usual to provide cast metal rings at the bottom and the top of the sheet metal jacket for holding the latter in position. These rings in use are frequently cracked and broken by the diflerential expansion in the outer and inner portions thereof. i 1 I As shown in Fig. 1, A is a furnace ring having an inner annular portion B which is connected to the outer annular portion C by a plurality of cross connections D, E, etc., with open spaces F therebetween. The ring Specification of Letters .Iatent.- Patented Jan. 19, 1915.

1912. Serial No. 668,839.

is further provided with beads or fianges G and; the; former surrounding the open spaces F "and forming a guide'for engagement with the sheet metal jacket I The connecting portion D which is ar-' ranged in front of the furnace is of consid-.

erab'le width, but the portions E are onlyemployed as cross connecting supports and are comparatively narrow. Nevertheless,

these' cross connections as usually constructed will transmit the expansion stresses caused by the heating of the inner ring to the outer ring section, frequently producing a strain which will crack the casting. W1th certain constructions this defect has" been avoided by dispensing with the integral cross connections E and providing adjustable cross braces, bolted or otherwise secured n position, but thls complicates and 1ncreases the expense of the construction. I

have avoided this difficulty by thefollowing method of construction: In the pattern from which the ring is cast the connecting portions E are formed of two overlapping lugs or ears E and E respectively projecting from the inner ring section B and the outer ring section G. These lugs or ears when the pattern is first formed lie adjacent to each other, but they are subsequently sprung apart and a core-print I is placed therebetween. When the mold cavity is formed, a core preferably formed of a metal plate coated with sand is placed in the cavity produced by the print I, and thus when the casting is made the ears E and E will be supported from each other by this core. The core is then driven out and the spring of the casting will be sufiicient to permit the ears tit-nae sTaTEs raT ET oEEioE.

E and E to come in contact. These ears are alsoformed with elongated registermg apertures J therein which are adapted to receive a bolt K by which the ears are clamped together.

In the complete casting the overlapping ears E and E clamped together by the bolt K will form just as strong a supporting con- While I have described the specific construction of a furnace ring it is obvious that my invention is applicable to other uses.

Vhat I claim as my invention is:

1. The method of forming an expansion joint in integral castings Which consists in separating overlapping portions of the integral structure While casting by a core, in subsequently removing said core, and in clamping said overlapping sections together to return the structure to its normal shape.

2. The method of forming expansion joints in castings which consists in separating overlapping portions of the structure While casting by a core and forming in said overlapping portions, registering apertures, in subsequently removing the core and securing an engaging bolt in said registering apertures to clamp said overlapping portions to each other to return the structure to its normal shape.

.3. The method of forming expansion joints in integral castings which consists in forming the mold with a pattern having overlapping portions sprung and distorted to separate the same, and a core print in be tween, in casting the structure With the separating core, and in clamping the overlapping sections'together to return the distorted structure to its normal shape.

The method of forming an expansion oint in an lntegral cast metal structure,

comprising an inner and an outer ring having connections therebetvveemwhich consists in separating and distorting overlapping portions of the pattern for the casting by a core print, in casting the structure with the separating core, and subsequently in clamping said overlapping sections together to return the distorted structure to its correct shape.

5. The method of forming an expansion joint in integral castings, comprising an inner ring and an outer ring connected by overlapping portions, Which consists in separating and distorting overlapping portions of the pattern for the casting by a core print, in casting the structure With the separating core, and in subsequently removing the core and clamping the overlapping sections so as to permit relative radial movement of the said sections and also to return the structure to its correct shape.

In testimony whereof I aflix my signature in presence of two Witnesses.

CHRISTOPHER F. CODA.

Witnesses JAMES P. BARRY, Mission E. FAY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

